Up to 3 days ago I used a Canvas in a SurfaceView to do all the graphics operations but now I switched to OpenGL because my game went from 60FPS to 30/45 with the increase of the sprites in some levels. However, I find myself disappointed because OpenGL now reaches around 40/50 FPS at all levels. Surely (I hope) I'm doing something wrong. How can I increase the performance at stable 60FPS? My game is pretty simple and I can not believe that it is impossible to reach them.

I use 2D sprite texture applied to a square for all the objects. I use a transparent GLSurfaceView, the real background is applied in a ImageView behind the GLSurfaceView.

Some code

    public MyGLSurfaceView(Context context, AttributeSet attrs) {
        super(context);
        setZOrderOnTop(true);
        setEGLConfigChooser(8, 8, 8, 8, 0, 0);
        getHolder().setFormat(PixelFormat.RGBA_8888);
        mRenderer = new ClearRenderer(getContext());
        setRenderer(mRenderer);
        setLongClickable(true);
        setFocusable(true);
    }

    public void onSurfaceCreated(final GL10 gl, EGLConfig config) {
        gl.glEnable(GL10.GL_TEXTURE_2D);
        gl.glShadeModel(GL10.GL_SMOOTH);

        gl.glDisable(GL10.GL_DEPTH_TEST);

        gl.glDepthMask(false);

        gl.glEnable(GL10.GL_ALPHA_TEST);
        gl.glAlphaFunc(GL10.GL_GREATER, 0);

        gl.glEnable(GL10.GL_BLEND);
        gl.glBlendFunc(GL10.GL_ONE, GL10.GL_ONE_MINUS_SRC_ALPHA);

        gl.glHint(GL10.GL_PERSPECTIVE_CORRECTION_HINT, GL10.GL_NICEST);
    }

    public void onSurfaceChanged(GL10 gl, int width, int height) {
        gl.glViewport(0, 0, width, height);
        gl.glMatrixMode(GL10.GL_PROJECTION); 
        gl.glLoadIdentity(); 

        gl.glOrthof(0, width, height, 0, -1f, 1f);

        gl.glMatrixMode(GL10.GL_MODELVIEW);
        gl.glLoadIdentity();
    }

    public void onDrawFrame(GL10 gl) {
        gl.glClear(GL10.GL_COLOR_BUFFER_BIT);

        gl.glMatrixMode(GL10.GL_MODELVIEW);
        gl.glLoadIdentity();

        gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);
        gl.glEnableClientState(GL10.GL_TEXTURE_COORD_ARRAY);

        // Draw all the graphic object.
        for (byte i = 0; i < mGame.numberOfObjects(); i++){
            mGame.getObject(i).draw(gl);
        }

        // Disable the client state before leaving
        gl.glDisableClientState(GL10.GL_VERTEX_ARRAY);
        gl.glDisableClientState(GL10.GL_TEXTURE_COORD_ARRAY);
    }

mGame.getObject(i).draw(gl) is for all the objects like this:

    /* HERE there is always a translatef and scalef transformation and sometimes rotatef */

    gl.glBindTexture(GL10.GL_TEXTURE_2D, mTexPointer[0]);

    // Point to our vertex buffer
    gl.glVertexPointer(3, GL10.GL_FLOAT, 0, mVertexBuffer);
    gl.glTexCoordPointer(2, GL10.GL_FLOAT, 0, mTextureBuffer);

    // Draw the vertices as triangle strip
    gl.glDrawArrays(GL10.GL_TRIANGLE_STRIP, 0, mVertices.length / 3);

EDIT:

After some test it seems to be due to the transparent GLSurfaceView. If I delete this line of code:

    setEGLConfigChooser(8, 8, 8, 8, 0, 0);

the background becomes all black but I reach 60 fps. What can I do?